I'm really hoping someone can help me as Orange as less than useless.

I have a Blackberry 8320 in the UK, provided by Orange. My home internet provider is through Tiscali and I have a Linksys wireless router. For the purposes of trying to make this work I have removed the WEP security from the wireless in the house so it now an open network.

When I search for wireless networks via the BB it finds mine and I am able to connect to it. So, "HomeNetwork" appears OK on the BB screen. However, the wifi icon remains greyed out and I cannot get away from GPRS or EDGE. I think what I'm looking for is UMA? The reception in my house is awful for Orange so it would be great if I could link up to the wireless to remedy the problem for making calls.

Can anyone in the world suggest what I can do to make my BB start picking up the network so it changes to UMA?

Finally, please reply in relatively layman's terms.

Thanks!